One who is engaged in the actual use or exercise of any art or profession, particularly that of law or medicine. Crabbe. [1913 Webster]
One who does anything customarily or habitually. [1913 Webster]
A sly or artful person. Whitgift. [1913 Webster]

General practitioner. See under General, 2.

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OXFORD DICTIONARY

practitioner, n. a person practising a profession, esp. medicine (general practitioner).

Etymology

obs. practitian = PRACTICIAN

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THESAURUS

practitioner

actor, agent, architect, author, creator, doer, executant, executor, executrix, fabricator, maker, medium, mover, operant, operative, operator, performer, perpetrator, prime mover, producer, subject, worker

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ROGET THESAURUS

practitioner

Agent

N doer, actor, agent, performer, perpetrator, operator, executor, executrix, practitioner, worker, stager, bee, ant, working bee, termite, white ant, laboring oar, servant of all work, factotum, workman, artisan, craftsman, handicraftsman, mechanic, operative, working man, laboring man, demiurgus, hewers of wood and drawers of water, laborer, navvy, hand, man, day laborer, journeyman, charwoman, hack, mere tool, beast of burden, drudge, fag, lumper, roustabout, maker, artificer, artist, wright, manufacturer, architect, builder, mason, bricklayer, smith, forger, Vulcan, carpenter, ganger, platelayer, blacksmith, locksmith, sailmaker, wheelwright, machinist, mechanician, engineer, sempstress, semstress, seamstress, needlewoman, workwoman, tailor, cordwainer, minister, servant, representative, coworker, party to, participator in, particeps criminis, dramatis personae, personnel, quorum pars magna fui, faber est quisque fortunae suae.

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